Centrifugal or velocity pump.



110.790.702. f y PATENTED MAY2s,10 05.

L. H. NASH.

CENTRIFUGAL OR VELOCITY PUMP. APPLIOATIoN-HLED Nqv. so, 190s.

511111011 Foz UNITED STATES Patented May 23, 1905.

PATENT OFFICE.

CENTRIFUGAL OR VELOCITY PUMP.

SPECIFICATION forming part of Letters Patent N0.790,702, dated May 23, 1905.

Application filed November 30, 1903. Serial No. 183,155.

-To (1J/Z whom it may con/cern:

Be it known that I, Lnwrs HALLooK NASH, a citizen of the United States, and a resident of South Norwalk, in the county of Fairfield 5 and State of Connecticut, have invented certain new and useful Improvements in Centrifugal or Velocity Pumps, of which the following is a specification.

My invention is directed to an improve- IO ment in centrifugal/or,velocity pumps, and is directed to means/for producing suction'in the supply-pipe, so that the pump can lift the water ilmajlllreservoir by its lown action. v

I5 This improvement converts the velocitypump into a suction or lift pump and greatly increases its usefulness. My invention can be .appliedltmanygform of veloityepump and is so simple that it caihereadilattached to 2O a pump already inservice.

I will now describe a device embodying my improvement in order that those skilled in the art may be able to practice my invention; but it will be understood that I do not confine my invention to the exact form of device shown in the drawings, as various'modilications may be made in the structure without departingy from the spirit and scope of my invention. The specific features of novelty will be pointed o ut in the iclaims concluding this specification.

Referring to the drawings, Figure l showsA a section through a centrifugal pump having my improvement attached to the same. Fig. 2 is an external view of the same. Fig. 3 is y a modified/form of apparatus, showing a different arrage'mentofthe-device.

In the drawings, 13 is the body of a centrifugal pump of well-known form, which is 40 provided with a revolving wheel of any approved pattern. The water is supposed to enter the pump through the supply-pipe l1, which is connected by a suitable suctionmain with the source of water-supply. This water enters the pump at .the center of the wheel, and after receiving a velocity by the action of the wheel it is discharged through the outlet-pipe 9. From the periphery of this pump I attach a pipe 4:, conveying the water to an injector-nozzle 5, while from the central portion of the pump I attach a pipe 6, leading to the suction portion of the injector. The discharge from this injector passes away through the pipe7 to any suitable reservoir l0, and said pipe opens, preferably, below the surface of the water, so as to form an air'-, seal. This reservoir 10 may be connected by the pipe l2 with the discharge-passage 9, or the pipe 7 may enter the passage 9 directly, as shown in Fig. 3.

8 is a pipe returning the water from the reservoir l() to the center of the pump.

It will be understood that the reservoir 10 may represent any convenient source of water-supply. Each of the pipes is provided with a valve for controlling the flow of water.

The operation of the device is as follows: Suppose the pump to'be running and a sufhcient quantity of Water to be in the reservoir 10 and in the discharge-pipe9 to make an air- 70 seal and let all the valves in the pipes be opened. YThe 'centrifugal force of the wheel will force a stream of water through the pipe I Ito the injector 5, and this will cause a vacu-l um in the pipe 6 and cause air to flow from 75 the wheel-chamber to the pipe 7. The mixed air and water will be discharged into the reservoir 10, from which the air will escape and the water will return to the wheel-chamber through the pipe Sandy continue its cir- 8O culation. This continuous circulation of the water willk produce a vacuum in the Wheelchamber and the suction-pipe 11 until the waterv from the source of supply is drawn up, filling thesuction-pipe and' the'wheel-cham- 85 ber, when the lvalves o may loe closed and the pump will be in full operation.

The object of the pipe l2 is as followsz'A In case the reservoir 10 is small and the standpipe 9 is large it may be necessary to refill 90 the reservoir l0 with water. For this purpose I have provided the pipe 12, which conveys the water from the stand-pipe 9 to the reservoir l0.

In Figs. l and 2 the device is shown dia- 95 grammatically and illustrates tlfe way in which f the invention may be applied to any pump, already in service; but it will be understood that the invention may be embodied in the structure of the pump itself. Eig. 3 shows TO0 one way in which this result may be secured. In this case the jet-nozzle is inserted in the pump-chamber at 5, so as to receive its water through the passage 4 and to discharge it through the passage 7 directly into the pipe 9. The pipe 6 leads from the pump-chamber to the suction part of the injector and is provided with a valve c. It will be understood that this pipe may be left permanently open, so as to remove any air that may be drawn in at the suction of the pump, or it may be closed after the pump is in full operation.

When open, the device will be always ready to operate when required.

In starting the pump the pump-chamber and the stand-pipe are filled with water. The rotation of the wheel will throw this water outward, leaving an air-space in the center of the pump-chamber. The velocity of the rotating water will cause a jet in the nozzle 5, which will induce suction through the pipe 4. The air thus drawn in will issue with the water into the outlet-pipe 9 and escape upward. The pipe 9 will remain filled with water, and some of it will flow down and enter the wheel-chamber and will be carried around with the wheel, so as to continuously supply the nozzle 5 with water, and this water will again pass into the pipe 9, where the air will be separated from it and escape upward, while the water will again return to continue the operation until the whole of the air has been removed from the pump and its passages.

I have thus far described the injector as being driven by the force of the pump; but I may lead a pipe 14 from any source of water under pressure and drive the injector with water obtained therefrom until the pump is charged with water; but in the majority of cases no such source of water-supply is available-as, for instance, when the pump is used for irrigation and is drawing water from a river or pond. In such cases a small reservoir or a small body of water left in the pumpchamber will serve to start the circulation and produce the lifting vacuum.

Referring to Fig. 3, in the operation of the device the case and the pipe 9 are supposed to contain a certain amount of water, and when the centrifugal force throws the water in ther case outward the air remaining in the ease will occupy the center. This air will be drawn out of the center of the case in the following manner: Some of this revolving water will be forced through the ejector-pipe 7, carrying With it some air. This air being lighter than the water will pass upward in the pipe 9. There will always be in the chamber water in rotation whose centrifugal force will balance the weight of the water in the stand-pipe. This rotating water will issue through the ejector,

carrying the air in the pipe with it into the stand-pipe.

I have thus described a few of the modifications embodying my invention; but l. do not confine my invention to the exact form of structure shown, all of which will be clearly pointed out in the claims concluding this specification; and it will be understood that the omission of an element from the claims is notice to the public that the said element is not an essential feature of the invention of said claims.

I claiml. The combination of a centrifugal pump with an injector, of a conduit conveying the water from the pressure portion of said pump to the injector, a conduit connecting the vacuum portion of said pump with the vacuum portion of the injector, and a conduit returning the water to the pump for the'purpose specified.

2. The combination with a velocity-pump and an injector, of a conduit from the periphery of said pump to said injector, and a conduit from the suction portion of said pump to the vacuum end of said injector.

3. The combination in a centrifugal pump with a pump-casing, of a passage leading from the pressure portion thereof and a passage leading from the vacuum portion thereof, a connection between said passages constructed to have an ejector action through the secondnamed passage, a separator into which air and water are delivered from said connections, whereby the airis separated from the water, and a conduit connecting said separator with the pum p-supply.

4. The combination in a centrifugal pump with a pump-casing and a passage leading from the vacuum portion thereof, of an ejector with the suction side of which said passage connects, a separator into which said ejector delivers, whereby the air is separated from the water delivered, the delivery end of said ejector being submerged in the water in the separator, and a passage connecting said separator with the pump-supply.

5. The combination in a centrifugal pump of a water-injector, with a conduit connecting the vacuum portion of the pump with the vacuum portion of the injector, and a conduit conveying the waste water from the injector to the pump, for the purpose specified.

Signed at Brooklyn,New York, in the county of Kings and State of New York, this 31st day of October, A. D. 1903.

LEWIS HALLOCK NASH.

Witnesses:

HERBERT R. BRowN, ROBERT H. DAvrsoN.

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